.page-faq {
  --faq-index-w: 272px;
  --faq-sticky-top: 24px;
  color: var(--paper);
  padding-bottom: var(--section-gap);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 60px) 0 clamp(28px, 4vw, 44px);
  background: linear-gradient(112deg, var(--ink-800) 0%, var(--ink-800) 50%, var(--ink-900) 50%, var(--ink-900) 100%);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .22;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
}

.page-faq .faq-hero__title {
  font-size: clamp(32px, 6vw, 62px);
  line-height: 1.06;
  letter-spacing: -.02em;
  font-weight: 800;
  margin: 14px 0 16px;
  max-width: 15em;
}

.page-faq .faq-hero__intro {
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
  margin: 0;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-faq .faq-hero__figure {
  margin: 0;
}

.page-faq .faq-hero__facts {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.page-faq .faq-hero__facts li {
  border-top: 2px solid var(--cyan);
  padding-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

.page-faq .faq-hero__facts .t-num {
  display: block;
  font-size: 26px;
  line-height: 1;
  color: var(--cyan);
  margin-bottom: 6px;
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

/* ---------- 分类快捷条 ---------- */
.page-faq .faq-triage {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding-bottom: clamp(20px, 3vw, 28px);
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-triage__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  border: 2px solid var(--line);
  background: var(--ink-800);
  color: var(--paper);
  font-size: 13px;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-triage__link .t-num {
  font-size: 11px;
  color: var(--orange);
}

.page-faq .faq-triage__link:hover,
.page-faq .faq-triage__link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: var(--ink-700);
  transform: translateY(-2px);
}

/* ---------- 两栏主体 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-faq .faq-index {
  border: 2px solid var(--line);
  background: var(--ink-800);
  padding: 18px 16px;
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-index .t-label {
  margin: 0 0 14px;
  color: var(--cyan);
}

.page-faq .faq-index__group + .faq-index__group {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}

.page-faq .faq-index__label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-index__link {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
  padding: 7px 8px;
  border-left: 2px solid transparent;
  color: var(--mist);
  font-size: 13px;
  line-height: 1.5;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-index__link .t-num {
  font-size: 11px;
  color: var(--orange);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--paper);
  border-left-color: var(--cyan);
  background: var(--ink-700);
}

@media (min-width: 1024px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: var(--faq-sticky-top);
  }
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 90px;
  margin-bottom: clamp(38px, 5vw, 64px);
}

.page-faq .faq-group:last-child {
  margin-bottom: 0;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px 14px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--line);
  margin-bottom: 18px;
}

.page-faq .faq-group__head .chapter-num {
  color: var(--orange);
  font-size: 20px;
  line-height: 1;
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.25;
  letter-spacing: -.01em;
  font-weight: 700;
}

.page-faq .faq-group__note {
  grid-column: 2;
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 34em;
}

.page-faq .faq-group__figure {
  margin: 0 0 18px;
}

/* ---------- 问答卡片 ---------- */
.page-faq .qa {
  scroll-margin-top: 90px;
  border: 2px solid var(--line);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .qa + .qa {
  margin-top: 14px;
}

.page-faq .qa:hover {
  border-color: #3d5f54;
}

.page-faq .qa[open] {
  border-color: var(--cyan);
  box-shadow: 2px 2px 0 rgba(0, 0, 0, .55);
}

.page-faq .qa__head {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  grid-template-areas:
    "num q"
    "num flag";
  gap: 8px 12px;
  align-items: start;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

.page-faq .qa__head::-webkit-details-marker {
  display: none;
}

.page-faq .qa__num {
  grid-area: num;
  color: var(--orange);
  font-size: 12px;
  line-height: 1.7;
}

.page-faq .qa__q {
  grid-area: q;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--paper);
  letter-spacing: -.005em;
}

.page-faq .qa__flag {
  grid-area: flag;
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  padding: 2px 8px;
  border: 1px solid currentColor;
  white-space: nowrap;
}

.page-faq .qa__flag--ok {
  color: var(--cyan);
}

.page-faq .qa__flag--live {
  color: var(--orange);
}

.page-faq .qa[open] .qa__q {
  color: var(--cyan);
}

.page-faq .qa__body {
  padding: 4px 16px 18px;
  border-top: 1px dashed var(--line);
  margin-top: 2px;
  animation: faq-reveal 200ms var(--ease) both;
}

@keyframes faq-reveal {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .qa__body p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
  max-width: 34em;
}

.page-faq .qa__body a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .qa__body a:hover,
.page-faq .qa__body a:focus-visible {
  color: var(--orange);
}

.page-faq .qa__steps {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  max-width: 36em;
}

.page-faq .qa__steps li {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper);
}

.page-faq .qa__steps .t-num {
  font-size: 11px;
  line-height: 1.9;
  text-align: center;
  color: var(--cyan);
  border: 1px solid var(--line);
  background: var(--ink-900);
}

@media (min-width: 640px) {
  .page-faq .qa__head {
    grid-template-columns: 24px minmax(0, 1fr) auto;
    grid-template-areas: "num q flag";
    align-items: center;
    gap: 14px;
    padding: 17px 20px;
  }

  .page-faq .qa__body {
    padding: 4px 20px 20px;
  }
}

/* ---------- 结尾联系条 ---------- */
.page-faq .faq-handoff {
  margin-top: clamp(44px, 7vw, 88px);
  padding: clamp(40px, 6vw, 76px) 0;
  background: linear-gradient(100deg, var(--ink-700) 0%, var(--ink-800) 58%, var(--ink-900) 100%);
  clip-path: polygon(0 1.5%, 100% 0, 100% 98.5%, 0 100%);
}

.page-faq .faq-handoff__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-faq .faq-handoff__lead .chapter-num {
  color: var(--orange);
  font-size: 18px;
}

.page-faq .faq-handoff__lead h2 {
  margin: 10px 0 12px;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.2;
  letter-spacing: -.01em;
  font-weight: 800;
}

.page-faq .faq-handoff__lead p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
  max-width: 30em;
}

.page-faq .faq-handoff__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .faq-handoff__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
}

.page-faq .faq-handoff__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 10px;
  height: 2px;
  background: var(--orange);
}

.page-faq .faq-handoff__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-handoff__meta {
  grid-column: 1 / -1;
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.9;
  color: var(--mist);
  word-break: break-word;
}

@media (min-width: 900px) {
  .page-faq .faq-handoff__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr);
    align-items: start;
    gap: 24px 48px;
  }

  .page-faq .faq-handoff__actions {
    grid-column: 1 / -1;
    margin-top: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__body {
    animation: none;
  }

  .page-faq .qa__head,
  .page-faq .qa,
  .page-faq .faq-triage__link,
  .page-faq .faq-index__link {
    transition: none;
  }

  .page-faq .faq-triage__link:hover,
  .page-faq .faq-triage__link:focus-visible {
    transform: none;
  }
}